Bell-shaped reflector for illuminating show windows



M m-1930. Hi'nA TmER 1, 5 92 01 BELL SHAPED REFLECTOR FOR ILLUMINA'IING'SHOW WINDOWS Filed June 28, 1927 Patented May 2 0, 1930 Hans HARTINGER,F JENA, GERMANY, ASSIGNORQBY MESNE ASSIGNMENTS, "r0 ZEISS IKON A-G., orBERLIN, GERMANY BELL-SHAPED BEFLECTOB FOR ILLUMINATING SHOW WINDOWSApplication filed .Tune 28, 1927, Serial No. 202,147, and in GermanyJune 30, 1926.

Reflectors for illuminating show-windows and the like, made of a glassbell, silvered outside and consisting of waves or zones graduatedrelatively to each other, whose light exit-aperture forms a. surfacedisposed at an oblique angleto the neck of the bell, have, owing to theshape chosen, hitherto only been made by means of pressing.

Pressed glass, however, is not very well suit- 10 ed for reflectorssince the surface of the reflectors made in this manner shows manyundesirable irregularities. Reflectors made of blown glass bells,however, are far better suited for the above purpose. Moreover,

owing to the possibility of using much thinne'r glass walls the latterreflectors mean a great saving in weight and material as compared withpressed reflectors and they also have a higher resistance to the changesof temperature.

The subject of the invention is a reflector of the aforesaid kind,having the advantages of blown reflectors. This improvement is attainedby choosing the bell-shape according to the invention in such a way thatthe glass bell (together with the waves or zones) forms a part of thebody of revolution whose axis coincides withthat the neck of the bell.

Such aselection of the bell-shape affords the manufacture of thereflectors by blowing; by continuous rotations during the blowingprocess. in a form corresponding to the profile of the bell theirregularities of the surface are compensated and the bells are inparticular exempt from press seams which otherwise always exist. The'newreflector admits of focussing the glow lamps, used as a source of lightwhose current supply main is, as usual, to be introduced through the 59disposed at an oblique angle relatively to the axis of rotation, i. e. asurface produced by the displacement of a straight line along anoptional guide curve. If the latter be itself a straight line, thepractically simplest case holds good that the light exit-surface of thetreflector is a plane.

The annexed drawing shows a constructional example of the invention.Fig. 1 shows the shape of the blown glass body in a longitudinalsection; Fig. 2 diagrammatia-ggo cally represents in a longitudinalsection on a reduced scale the finished reflector when used forilluminating a show-window.

The glass body silvered outside is a body of revolution'provided withzones a a a e graduated relatively to each other. Its axis of rotation bcoincides with the axis of the neck of the bell. The light exit-surfaceg is a plane inclined at an angle of 45 to the axis of rotation 5.Another suitable forn1 'T-70 of the light exit-surface is obtained bycutting off the glass body by a cylindrical surface whose guide curve 7is shown in the drawing by dot and dash lines and whose surface linesare perpendicular to the drawing -r7 plane. a

The fitting of a finished reflector i with glow lamp is, used as asource of light, in a show-room m closed by a window pane Z takes placein the manner illustrated in Fig.2a2180 2, the illuminating body beingfixed at the ceiling of the show-room near the pane Z. The reflector imust in this case be brought by rotation about its axis of rotation intosuch a position that onlookers, standingini'z'vss front of the pane Z,cannot be dazzled but that both the floor and the back wall of theshow-room m are struck by the light.

I claim:

'1. Reflector consisting of a glass bell sil vered out-side, containinga neck adapted to receive a holding device, the glass bell beingprovided with waves or zones graduated relatively to each other andforming together with the waves or zones a part of a bodyof 9 revolutionwhose axis coincides with the axis of the said neck and the margin ofthe bell lying on a surface, substantially inclined at an oblique angleto the said axis.

2. Reflector consisting of a glass bell sil 'vered outside, containing aneck adapted to I receive a holding device, the, glass bell beingprovided with waves or zones graduated relatively to each other andforming together with the Waves or zones 2 part of a body of revolutionWhose axis'coincides with the axis of the saidne'ok and the margin ofthe bell lying on a plane, inclined atan oblique angle to the said axis.

i1 7 HANS HARTINGER.

